Judith Smith or Judy Smith could refer to:

• Judith Smith Ladson (1766-1820), American socialite and heiress
• Judith Winsor Smith (1821-1921), American women's suffrage activist and abolitionist
• Judith Kaye (born Judith Ann Smith) (1938-2016), American jurist and former Chief Judge of the New York Court of Appeals
• Judy Smith (born 1958), American crisis manager
• Judith Anne Smith, American jurist and Associate Judge on the Superior Court of the District of Columbia
• Judith Eldredge Smith, American homicide victim
• Judy Seriale Smith, state legislator in Arkansas